Check the properties of your avi's they should be 320x240 to match the player.
try this sample rockchip avi video:-
http://www.mympxplayer.org/sample-ro...ons-df628.html
The player is an unbranded Rockchip player, dealextreme.com has some similar looking players.
http://www.dealextreme.com/details.dx/sku.9323
